| http://www.w3.org/ns/prov#value | - The resilient hooks 13 are made from a resiliently elastic material, for example from a plastic or a metal of low strength, so that, when they are subjected to a radially inwardly directed force, for example by contact with the undercut 15 (which also can be referred to as a relieved area or areas), the hooks 13 yield substantially in the radial direction by bending at their base and/or over their
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